diff --git a/stack.sh b/stack.sh
index 3d73ef3..3b66db5 100755
--- a/stack.sh
+++ b/stack.sh
@@ -211,7 +211,7 @@ GLANCE_HOSTPORT=${GLANCE_HOSTPORT:-$HOST_IP:9292}
 
 # Service Token - Openstack components need to have an admin token
 # to validate user tokens.
-SERVICE_TOKEN=${SERVICE_TOKEN:-`uuidgen`}
+SERVICE_TOKEN=${SERVICE_TOKEN:-`openssl rand -hex 12`}
 ADMIN_PASSWORD=${ADMIN_PASSWORD:-`openssl rand -hex 12`}